标题： 非对称双中子星并合中的动力学质量抛射：广义相对论中的辐射流体动力学研究 显示英文标题

标题： Dynamical mass ejection from the merger of asymmetric binary neutron stars: Radiation-hydrodynamics study in general relativity

摘要： 我们对数值相对论中非对称双中子星合并进行了中微子辐射流体动力学模拟。 中子星由软和中等刚性的有限温度方程状态（EOS）进行建模。 我们发现，对于给定的EOS，动态抛射物的性质，如总质量、中子丰富度分布和比熵分布，以独特的方式依赖于二元系统的质量比。 对于软EOS（SFHo），总抛射质量对质量比的依赖较弱，但抛射物的平均电子数每重子（$Y_e$）和比熵（$s$）随着质量不对称程度的增加而显著下降。 对于刚EOS（DD2），随着质量不对称程度的增加，总抛射质量显著增加，而平均的$Y_e$和$s$适度下降。 我们再次发现，只有对于软EOS（SFHo），无论本文中选择的质量比如何，总抛射质量都超过$0.01M_\odot$。 不管采用哪种EOS，抛射物的每重子电子数多种多样，其平均值大致在$Y_e \sim 0.2$和$\sim 0.3$之间，这非常适合产生r过程重元素（第二和第三峰），尽管其平均值随着质量不对称程度的增加而下降。 显示英文摘要

摘要： We perform neutrino radiation-hydrodynamics simulations for the merger of asymmetric binary neutron stars in numerical relativity. Neutron stars are modeled by soft and moderately stiff finite-temperature equations of state (EOS). We find that the properties of the dynamical ejecta such as the total mass, neutron richness profile, and specific entropy profile depend on the mass ratio of the binary systems for a given EOS in a unique manner. For the soft EOS (SFHo), the total ejecta mass depends weakly on the mass ratio, but the average of electron number per baryon ($Y_e$) and specific entropy ($s$) of the ejecta decreases significantly with the increase of the degree of mass asymmetry. For the stiff EOS (DD2), with the increase of the mass asymmetry degree, the total ejecta mass significantly increases while the average of $Y_e$ and $s$ moderately decreases. We find again that only for the soft EOS (SFHo), the total ejecta mass exceeds $0.01M_\odot$ irrespective of the mass ratio chosen in this paper. The ejecta have a variety of electron number per baryon with its average approximately between $Y_e \sim 0.2$ and $\sim 0.3$ irrespective of the EOS employed, which is well-suited for the production of the r-process heavy elements (second and third peaks), although its averaged value decreases with the increase of the degree of mass asymmetry.